单项选择题
A.the solid impurities of large particle B.the solid impurities of fine particle C.the water content D.both water and solid impurities
Impurities in the fuel oil will affect the operation of...
单项选择题Impurities in the fuel oil will affect the operation of the engine, which has （） the use of separator and some other devices.
A.brought about B.caused for C.resulted from D.led
The lube oil to lubricate the surfaces of the cylinder ...
单项选择题The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.
A.sliding piston rings B.engines camshaft C.small pumps D.forced feed system
The most important factor that causes the wear of the e...
单项选择题The most important factor that causes the wear of the engine parts is （）.
A.excessive heat B.friction C.oxidation D.high pressure
